Slifer the Sky Dragon:
Slifer's attack and defense both read X000: They only go up by the amount of cards in your hand (example: 4 cards, slifer's attack and defense are both 4000)
Slifer's other effect is his second mouth, for example, whenever an opponent summons out a monster, Slifer instantly delivers 2000 damage to the monster's attack. And if the monster's attack is lower than 2000 it's automatically destroyed and the Battle Damage is Calculated like normal

Obelisk the Tormentor:
Atk/4000 Def/4000
Effect 1: Offer 2 monster's to Obelisk to destroy all opponent's monsters and deal 4000 damage to the opponent's lifepoints.
Effect 2: Offer 1 Monster to Obelisk and add half of the attack to the offered monster onto Obelisk (this effect can be used more than once per turn)

Winged Dragon of Ra:
Atk/???? Def/????
Effect: The Winged Dragon of Ra can only be summoned by chanting this chant:
Great beast of the sky, please hear my cry,
Transform thyself from orb of light and bring me victory in this fight.
Envelope the desert with your glow and cast your rage upon my foe.
Unlock your powers deep within so that together we may win.
Appear in this Shadow Game as I call your name...
The Winged Dragon of Ra!
When the first verse is chanted whoever chants it first has rightful ownership of Ra.
The Second Verse, offer 7999 of your lifepoints and add it onto Ra's Attack U have to have 8000 life points for this to work
The Third Verse, When this chant is said, Destroy all Monster's on your opponents side of the Field.
The Winged Dragon Of Ra gets its attack by adding up the attack of the 3 monsters you offer for it.